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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The coracobrachialis starts on the front of the shoulder joint and stretches out to the upper arm bone. Conjointly, the these two muscles assist the latissimus dorsi in shoulder adduction during the pull up. This action moves your upper arm bone in, and lifts your body up to the bar. Long Head of the Triceps. The triceps muscle is made up of three heads: lateral, long and medial.